Ball valves [series 90] conform to ansi b 16.104 class vi leakage these ball valves are reduced bore/full bore valves of 3-piece sandwich construction 2-body connectors forming the pipe to valve connetions available in scrwed or socket weld ends the body of the valves fit in between the connectors and contain ball ptfe body connectors seal and stem asembkly the corrosion resistant ball is held between the body connector bolting which ensures leak-tight shut-of in both directions under pressure or vacuum the seal is effected by spring discs loading a ptfe stem seal positioned between shoulders on the stem and body
